Add support for DRM leasing and significantly rework composition code

* 12to11.c (HandleCmdline): Improve messages printed during
-help.
(XLMain): Initialize DRM leasing.
* 12to11.man: Document changes.
* Imakefile (LOCAL_LIBRARIES): Add xcb-randr, xf86drm and
XPresent.
(SRCS): Add drm_lease.c.
(OBJS): Add drm_lease.o.
* atoms.c (names): Add CONNECTOR_ID.
(CONNECTOR_ID): New atom.
(XLInitAtoms): Intern CONNECTOR_ID.
* compositor.h (struct _RenderFuncs): Require event mask to be
passed to target_from_window.  New functions
`set_standard_event_mask', `present_to_window',
`cancel_presentation_callback', and `cancel_presentation'.
(struct _BufferFuncs): Move buffer release machinery here.
(enum _FrameMode): New enum.
* egl.c (TargetFromWindow, SetStandardEventMask,
egl_render_funcs): Adjust functions accordingly.
* frame_clock.c (struct _FrameClock): New fields
`end_frame_called' and `pending_sync_value'.
(HandleEndFrame, PostEndFrame, StartFrame, EndFrame): Clean up
frame synchronization code.  Do not end upon predicted
presentation time if EndFrame was not called in time.
(FreezeForValue): New function.
(XLFrameClockHandleFrameEvent): Defer actually freezing until
StartFrame happens.
(XLFrameClockGetFrameTime): New function.
* icon_surface.c (ReleaseBuffer): Use RenderWaitForIdle.
(RunFrameCallbacks, AfterFrame): Pass frame clock to callbacks.
Use frame time if available.
(XLGetIconSurface): Require wait_for_idle to work.
* output.c (change_hook): New hook.
(XLHandleOneXEventForOutputs): Run hook if set.
(XLOutputSetChangeFunction): New function.
(XLInitRROutputs): Select for RRResourceChangeNotify if
providers are supported.
* picture_renderer.c (struct _PresentRecord)
(struct _BufferActivityRecord, struct _IdleCallback)
(struct _PictureBuffer, struct _PictureTarget)
(struct _DrmFormatInfo, struct _DmaBufRecord)
(struct _PresentCompletionCallback): New record structures.
(all_formats, SendRoundtripMessage, FindBufferActivityRecord)
(RecordBufferActivity, RunIdleCallbacks, MaybeRunIdleCallbacks)
(UnlinkActivityRecord, HandleActivityEvent, InitRenderFuncs)
(TargetFromDrawable, TargetFromPixmap, TargetFromWindow)
(SetStandardEventMask, NoteTargetSize, PictureFromTarget)
(DestroyRenderTarget, FillBoxesWithTransparency)
(ServerRegionFromRegion, ClearRectangle, Composite)
(FindPresentRecord, AllocateRecord, PresentToWindow)
(CancelPresentationCallback, CancelPresentation)
(picture_render_funcs, FindSupportedModifiers, InitDrmFormats)
(PictFormatIsPresentable, BufferFromDmaBuf, FinishDmaBufRecord)
(BufferFromDmaBufAsync, BufferFromShm, BufferFromSinglePixel)
(FreeShmBuffer, FreeDmabufBuffer, FreeSinglePixelBuffer)
(AddIdleCallback, CancelIdleCallback, IsBufferIdle)
(IdleEventPredicate, WaitForIdle, SetNeedWaitForIdle)
(picture_buffer_funcs, HandlePresentCompleteNotify)
(HandlePresentIdleNotify, HandlePresentationEvent)
(HandleOneXEventForPictureRenderer, InitPictureRenderer): Allow
presenting pixmaps directly, and move buffer release tracking
machinery here.
* renderer.c (RenderTargetFromWindow): Update signature.
(RenderPresentToWindow, RenderCancelPresentationCallback)
(RenderCancelPresentation, RenderAddIdleCallback)
(RegisterStaticRenderer): New wrapper functions.
* run.c (HandleOneXEvent): Handle picture renderer events
earlier.
* seat.c (MaybeCreateCursor): Require wait_for_idle.
(ReleaseBuffer): Wait for buffer to become idle on each target
in the cursor ring.
* subcompositor.c (struct _Subcompositor): New callback
`note_frame'.
(SubcompositorSetNoteFrameCallback, NoViewsAfter)
(PresentCompletedCallback): New functions.
(SubcompositorUpdate): Try to present the buffer if possible,
and run completion callbacks.
(SubcompositorFree): Free presentation key.
* surface.c (XLSurfaceRunFrameCallbacksMs): New function.
* text_input.c: Improve commentary.
* xdg-shell.xml: Update from wayland-protocols.
* xdg_surface.c (struct _XdgRole): New fields `pending_frame',
`last_specified_serial'.
(struct _ReleaseLaterRecord): Replace free function with idle
callback key and xdg role pointers.
(RemoveRecord): Delete function.
(FreeRecords): Stop cancelling buffer destroy listener.
(ReleaseLaterExtBufferFunc): Delete function.
(RunFrameCallbacks): Use frame clock time if it is set.
(HandleReleaseLaterMessage): Delete function.
(BufferIdleCallback): New function.
(ReleaseLater): Delete function.
(XLHandleXEventForXdgSurfaces): Stop handling buffer release
events here.
(AckConfigure): Improve debug code and reject duplicate serials.
(Commit): Unfreeze earlier; also, in general...
(NoteFrame): Move frame handling implementation here.
(ReleaseBuffer, Subframe, EndSubframe, AfterFrame, ResizeForMap)
(SelectExtraEvents): Set standard event mask.
(XLGetXdgSurface, XLXdgRoleSendConfigure): ...Replace frame
clock logic with that in NoteFrame.

Imakefile

@@ -1,4 +1,4 @@
-#include "libraries.def"
+#include "12to11.conf"
 
 #ifndef HasPosixThreads
 #error "Posix threads are required"
@@ -10,7 +10,8 @@ DEPLIBS = $(DEPXLIB) $(DEPEXTENSIONLIB) $(DEPXRANDRLIB) $(DEPXRENDERLIB) \
 
 LOCAL_LIBRARIES = $(XLIB) $(EXTENSIONLIB) $(XCBLIB) $(XCB) $(XCB_SHM)      \
   $(XRANDRLIB) $(PIXMAN) $(XRENDERLIB) $(XILIB) $(XKBFILELIB) $(XFIXESLIB) \
-  $(XCB_DRI3) $(XCB_SHAPE) $(WAYLAND_SERVER)
+  $(XCB_DRI3) $(XCB_SHAPE) $(WAYLAND_SERVER) $(XCB_RANDR) $(DRM)           \
+  $(XPRESENTLIB)
 
 INCLUDES := $(DRMINCLUDES) $(PIXMANINCLUDES)
 
@@ -22,7 +23,7 @@ SRCS = 12to11.c run.c alloc.c fns.c output.c compositor.c       \
   icon_surface.c primary_selection.c renderer.c                 \
   picture_renderer.c explicit_synchronization.c transform.c     \
   wp_viewporter.c decoration.c text_input.c                     \
-  single_pixel_buffer.c
+  single_pixel_buffer.c drm_lease.c
 
 OBJS = 12to11.o run.o alloc.o fns.o output.o compositor.o       \
   surface.o region.o shm.o atoms.o subcompositor.o positioner.o \
@@ -32,7 +33,7 @@ OBJS = 12to11.o run.o alloc.o fns.o output.o compositor.o       \
   icon_surface.o primary_selection.o renderer.o                 \
   picture_renderer.o explicit_synchronization.o transform.o     \
   wp_viewporter.o decoration.o text_input.o                     \
-  single_pixel_buffer.o
+  single_pixel_buffer.o drm_lease.o
 
 GENHEADERS = transfer_atoms.h
 
@@ -115,6 +116,7 @@ ScannerTarget(viewporter)
 ScannerTarget(xdg-decoration-unstable-v1)
 ScannerTarget(text-input-unstable-v3)
 ScannerTarget(single-pixel-buffer-v1)
+ScannerTarget(drm-lease-v1)
 
 /* Make OBJS depend on scanner headers, and depend on both them and SRCS.  */
 $(OBJS): $(GENHEADERS)